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  • elements
    • atoms can have different numbers of protons, neutrons, and electrons.
      • The number of protons in the nucleus decides what type of atom it is.
      • for example, an atom with on proton in its nucleus is hydrogen, and an atom with two protons is helium.
    • if a substance only contains atoms with the same number of protons its called an element
    • 100's of different elements.
    • all of the atoms of a particular element have the same number of protons and diffrent elements have diffrent numbers of protons.
    • Atoms of each element can be represented by a one or two letter symbol.
      • most symbols derive from Latin names for the elements.
        • Lead- Pb   Iron-Fe       Sodium-Na
        • All of these symbols appear on the periodic table
    • Elements can be found on the periodic table. This shows all 118 different elements that appear in this universe.


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